Do I need a transit visa for the itinerary below?

I am am Australian citizen travelling on the itinerary below. Will I need one if I stay in the transit lounge at Urumqi and Guangzhou?
China Southern airlines:-
6/9/2013 TASHKENT, Uzbekistan1.30AM. URUMQI, 7.00AM
6/9/2013 URUMQI, 11.50AM. GUANGZHOU, 4.40PM
6/9/2013. GUANGZHOU, 9.05PM. 7/9/2013 SYDNEY, Australia, 8.30AM